Merge branch 'master' into jgrpp

# Conflicts:
#	Makefile.src.in
#	findversion.sh
#	projects/determineversion.vbs
#	src/aircraft_cmd.cpp
#	src/lang/dutch.txt
#	src/linkgraph/linkgraph_gui.cpp
#	src/linkgraph/linkgraph_gui.h
#	src/order_cmd.cpp
#	src/settings_gui.cpp
#	src/smallmap_gui.cpp
#	src/town_cmd.cpp
#	src/viewport.cpp
#	src/water_map.h

src/engine.cpp

@@ -662,7 +662,14 @@ void StartupOneEngine(Engine *e, Date aging_date)
 	/* Don't randomise the start-date in the first two years after gamestart to ensure availability
 	 * of engines in early starting games.
 	 * Note: TTDP uses fixed 1922 */
+	SavedRandomSeeds saved_seeds;
+	SaveRandomSeeds(&saved_seeds);
+	SetRandomSeed(_settings_game.game_creation.generation_seed ^
+	              ei->base_intro ^
+	              e->type ^
+	              e->GetGRFID());
 	uint32 r = Random();
+
 	e->intro_date = ei->base_intro <= ConvertYMDToDate(_settings_game.game_creation.starting_year + 2, 0, 1) ? ei->base_intro : (Date)GB(r, 0, 9) + ei->base_intro;
 	if (e->intro_date <= _date) {
 		e->age = (aging_date - e->intro_date) >> 5;
@@ -682,6 +689,7 @@ void StartupOneEngine(Engine *e, Date aging_date)
 
 	e->reliability_spd_dec = ei->decay_speed << 2;
 
+	RestoreRandomSeeds(saved_seeds);
 	CalcEngineReliability(e);
 
 	/* prevent certain engines from ever appearing. */